Die-casting ejector



B. E. BOLLING..

' DIE'CA STING ETIECTOR.

APPLICATION FILED JAN-15, I920.

1,394,24 Patented 001;. 18, 1931.

UNITED STATES PATENT OFFICE.

BALTZAB EMANUEL ROLLING, 0F RACINE, WISCONSIN.

DIE-GASTIN G EJ'ECTOR.

Specification of Letters Patent.

- Application filed January 15, 1920. Serial No. 351,639.

scription, peference being had to the accompanying drawings, which arespecification.

This invention relates to improvementsin die casting ejector for a diecasting machine.

In the ordinary die casting mach ne many of the castings are broken inejecting them from the molding die parts or sect ons due to the unequalstrains placed on the castings in forcing them outof the dies. This lossmaterially increases the enpense of the perfect casting and is otherwiseob ect onable in limiting the output of the machine.

It is one of the objects of the present invention to overcome the beforementioned objectionable features and provide a die casting ejector whichwill exert an equal strain upon different portions of the-casting inejecting it from the mold part and thus eliminate the larger part of thebreakage and increase the capacity of thecastmg machine.

A further object of the invention is to provide a die casting ejector inwhich means are provided for positively-positioning the ends of theejector pins with relation to the recess of the molding die to preventthe marring of the casting by said pins.

A further object of the invention is to provide a die casting ejector inwhich the die ejecting means is moved upwardly while the die art ismoved downwardly to positively e ect the casting.

A further object of the invention is to provide a die casting ejector inwhich the ejector pins and the stop pins are maintained in proper alinedposition to prevent tilting and unequal strains u on the casting whileejecting it from the die parts.

A further object of the invention is to provide a die casting ejector inwhich the ejector parts may be easily changed; and other partssubstituted therefor. to eject castings of various shapes and sizes;

A further object of the invention is to provide a die casting ejectorwhich is of simple construction, is strong and durable a part of thisand is well adapted for scribed.

With the above and other objects in view, the invention consists of theimproved die castmg'ejector and its parts and combinatlons as set forthin the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference charactersindicate the same parts in all of the views:

Figure 1 is a central vertical sectional view of a portion of a diecasting machine prgvided with the improved casting ejector; an

Fig. 2 is a transverse sectional view thereof taken on line 2-2 of Fig.1.

the purpose de- Referring to the drawing, the numeral 5' indicates aportion of a die casting machine in which 6 is a vertical reciprocalhead or table, '7 the ejector plunger head and 8 the die block mountedon the head. The reciprocal head 6 slides in the bearings 9 of themachine frame and the die block 8 is adjustably mounted on the upperportion of the head in any manner desired. The head 6 is formed with arectangular recess 10 and the die block 8 is provided with ver- PatentedOct. 18, 1921.

tically extending central opening 11 of rectangular shape whichregisters with the recess 10 to accommodate the ejector plunger head 7.A casting die part 12 having a casting recess 13 in its upper portion ismounted on top of the die block 8 and coacts with a companion die part14 carried by a fixed head (not shown) of the machine. This upper diepart 14 is also provided with a recess 13 in register with the recess 13and forming space therewith in which the casting is molded' The moltenmetal to the die space is fed through the opening 15 formed between thetwo die parts. The lower die part 12 is also provided with verticallyextending ejector. pin holes 16 and stop pin holes 17 for receivingejector pins 18 and stop pins 19 respectively, which extend slidablytherethrough. The lower headed ends of the pins are mounted between andsecurely fastened to plates 20 which rest loosely upon the ejectorplunger head 7 so that when the reciprocal head 6 is moved downwardly toseparate the die parts, the lower die part will first separate When thecasting has been discharged, the lower die part is moved upwardly, andthe stop pins, which project upwardly through the upper die part, willengage the lower face of the upper die and be held in. position whilethe lower die is moved into engagement with the upper die, and thusexactly position the upper ends of the ejector pins with relation to theupper surface of the recess of the lower die part. The upper surface ofthe ejector plunger head 7 is perfectly flat and the lower surface ofthe lower pin plate is likewise and as the plates are held on theplunger head by the stop pins, the ejector pins will be maintained inalined position with relation to the ejector pin holes and preventtilting the casting in ejecting it from the die.

The ejector plunger head is mounted on the upper end portion of aplunger stem 21 which. extends vertically through spaced bearings 22 and:23 forming part of the reciprocal head 6. A lever 24 having a slot 925formed in its outer end is pivotally slidably connected said end to thereciprocal head by a bifurcated pivot bolt 26. The inner end said leveris bifurcated and straddles a medial portion the plunger stem 21 andpivotally connected thereto by a pivot bolt 2?. A tubular sleeve 28pivotally connected at its upper end to a medial portion of the lever24- extends downwardly therefrom and telescopes over the upper endportion oi. an upstanding threaded rod 29 which is pivotally connectedat its lower end to the base portion 30 of the machine or to the floor.Nuts 31 adjustably threaded on the rod 29 limit the downward movement ofthe sleeve 28 so that when the reciprocal head moves downwardly apredetermined distance to separate the lower die part from the upper diepart, the downward movement of the ejector parts will be stopped whenthe sleeve strikes the nuts and a farther downward movement of thereciprocal head will force the inner end of the lever and the plungerand the pins upwardly to positively discharge the casting from the lowerdie part as before described.

From the foregoing description, it will be seen that the die castingejector is of very simple construction and is well adapted tor thepurpose described.

llfhat ll claim as my invention is:

l. The combination with a die casting machine having va reciprocal headcarrying a die part provided with ejector openings.. of means forpositively ejecting castings from said die part, comprising meansextending into said openings and movable therethrough after saidreciprocal head has reciprocated a predetermined distance.

2. The combination with a die casting machine having a reciprocal headcarrying a die part provided wtih ejector pin openings,

intense of means for positively ejecting castings from said die part,comprising an ejector plunger reciprocally carried by the head andhaving pins which extend into the die part for forcing a casting out ofthe die part, an automatically moved lever controlling the movement ofthe ejector plunger, and other means operated by movement of said-headfor automatically controlling the movement of the lever.

3. The combination with a die casting machine having a reciprocal headcarrying a die part provided with ejector pin openings, of means forejecting castings from said die part, comprising an ejector plungerreciprocally carried by the head and having pins which extend into thedie part for forcing a casting out oi the die part, an automaticallymoved-lever pivotally connected to the reciprocal head to the ejectorplunger and means automatically controlling the movement of the lever i.The combination with a die casting machine having a reciprocal headcarrying a die part provided with. ejector pin openings. of means forejecting castings from said die part comprising ejector plungerreciprocally carried by the head and having pins which extend into thedie for forcing; a casting out of die part an automatically moved leverpivotally connected to the reciprocal head and to the ejector plunger.,and means connected to the lever and to a support for automaticallylimiting the movement of a portion of the lever to cause another portionthereof to move in the opposite direction when the reciprocal head hasmoved a predetermined distance to separate die parts.

5. The combination with a die casting ma chine having a fixed dieportion and a reciprocal head carrying a die part provided with ejectorpin and stop pin openings, of means for ejecting castings from saidparts, comprising an ejector plunger reciprocally carried by the head, aplate mounted on the plunger and having projecting stop pins whichextend through the stop pin openings and engage the tired die part andalso having ejector pins which extend through the ejector pin openingsand engage the casting formed between the die parts an automatisallymoved lever pivotally connected to the reciprocal head and to theejector plunger, and means connected to the lever and to a support forautomatically limiting the movement'oi a portion of the lever to causeanother portion thereof to move in the opposite direction and force thepins through the die part when the reciprocal head has moved apredetermined distance to separate the die parts.

6. The combination with a die casting machine having a fixed die portionand a reciprocal head carrying a die part provided with lid ejector pinand stop pin openings, of means for ejecting castings from said parts,comprising an ejector plunger reciprocally carried by the head, a platemounted on the plunger and having projecting stop pins which extendthrough the stop pin openings and engage the fixed die part and alsohaving ejector pins which extend through the ejector pin openings andengage the casting formed between the die parts, an automatically movedlever pivotally connected to the reciprocal head and to the ejectorplunger, 1

a member pivotally connected to the lever, another member connected to asupport and slidably connected to the last mentioned member, and meansautomatically limiting the slidable movement between said members forstopping the movement of a portion of.

the lever to cause another portion thereofto move upwardly and force thepins through the die part when the reciprocal head has moved apredetermined distance to separate the die parts.

7. The combination with a die casting machine having a fixed die,portion and a reciprocal head carrying a die part provided with ejectorpin and stop pin openings, of means for ejecting castings from saidparts,

comprising an ejector plunger reciprocally carried by the head, a platemounted on the plunger and having projectlng stop plns which extendthrough the stop pln openlngs and engage the fixed die part and alsohaving ejector pins whcih extend through the ejector pin openings andengage the casting formed between the die parts, an automatichine havinga fixed die portion and a reciprocal head'carrying a die part providedwith ejector pin and stop pin openings, of means for ejecting castingsfrom said parts, comprising an ejector plunger reciprocally-carried bythe head, a plate mounted on the plunger and having projecting stop pinswhich extend through the stop pin openings and engage the fixed die partand also having ejector pins which extend through the 8. The'combinationwith a die casting mae ector pin openings and engage the casting formedbetween the die parts, an automatically moved lever pivotally connectedto the reciprocal head and to the ejector plunger, a tubular memberpivotally connected to the lever, a threaded rod pivot-ally connected toa support and extending into the tubular member, and a nut threaded onthe rod for automatically limiting the movement of the sleeve withrelation to the rod.

ture.

"BALTZAR EMANUEL ROLLING.

In testimony whereof, I aflix my signa- I

